Sunspot geolocation scenario setup

Question

Sunspot geolocation scenario setup

I use Sunspot to find and use Geocoder for addresses, and then to calculate distances, Geokit-rails3 .

class Product < ActiveRecord::Base
  belongs_to :store
  searchable do
    text :name
  end 
end

class Store < ActiveRecord::Base
  acts_as_mappable
  geocoded_by :address, :latitude => :lat, :longitude => :lng
  attr_accessible :lat, :lng, :address
  has_many :products
end

Question

What I want when entering into a product search is also the ability to enter an address inside another field to search for products in this area with a radius of 30 miles.

This is my controller that allows me to search Products:

class SearchController < ApplicationController

  def index
    @search = Product.search do |q|
      q.fulltext params[:search]
    end
    @products = @search.results
  end
end

So, I believe that the form will look something like this as soon as I finish:

<%= form_tag search_path, :method => 'get' do %>
        <%= text_field_tag :search, params[:search]" %>
        <%= submit_tag "Search", :name => nil %>
        <p> Search Near: </p>
        <%= label_tag :location, "Search nearby an Address" %>
        <%= text_field_tag :location, params[:location] %>
<% end %>